Mechanical movement



Feb. 16, 1932. T. c. KORSMO 1,845,844

MECHANICAL MOVEMENT Filed Nov. 30, 1929 2 Sheets-Sheet 1 Feb. 16, 1932. T. c. KORSMO MECHANICAL MOVEMENT Filed Nov. 30, 1929 Z Sheets-Sheet 2 2Q Z I? Patented Feb. 16, 1932 UNITED STATES PATENT. OFFICE TORBJOBN CONRAD KORSMO, OI MADISON, WISCONSIN, ASSIGNOR TO MADISON-XII? CORPORATION, OF MADISON, WISCONSIN, A CORPORATION OF WISCONSIN MECHANICAL MOVEMENT Application filed November 30, 1929.

This invention relates to mechanical movements, particularly those in which use is made of cam means for effecting desired operation of the parts.

The device, in general, comprises a lever, together with its pivotal support, and a cam which acts on the lever to rotate the latter about its pivot upon relative movement between the pivotal support and the cam.

It is a particular object of the invention to provide a device of this character in which the lever will be rotated through a definite angle the result of predetermined, relative movement between the pivotal support and the cam. Desired "ariations of the angle through which the lever is displaced may be obtained readily by substituting cams of different shapes. The exact shape of the cam to be used depends upon the angular displacement desired and the distancetraveled by the pivotal support.

The novel cam means devised for effecting the desired angular movement of the lever forms a feature of the invention. A further feature is the arrangement of the parts whereby angular movements, heretofore unobtaina le, may be imparted to the pivoted lever.

A practical embodiment of the invention, now in successful commercial use, is shown in the accompanying drawings as applied to a die casting machine for the purpose of operating the cores which project into the die cavity. This particular application of the device is shown solely for the purpose of illustration. Obviously, there are many other uses to which it may be put.

In the drawings, Figure 1 represents a side elevational view of a portion of a die casting machine with the die closed and the cores extending into the die cavity, the parts of the present device being shown in the relative positions which they assume at this time:

Figure 2, a plan view of the same portion of the machine, there being shown in dotted lines the relative positions assumed by the various parts of the instant device when the die is open and at a point intermediate the open and closed positions, in addition to the initial position of the parts;

Figure 3, a diagrammatic, plan view of a Serial No. 410,786.

modified form of the device, with the lever shown in full in the position it assumes when the die is closed, and, in dotted lines, the position it takes when the die is open and a third position intermediate the two positions just-mentioned Figure 4, a similar view of another modification of the device; and

Figure 5, a similar View of still another modified form.

The present device is shown in Figs. 1 and 2 as applied to a die casting machine of the type covered by my Patent No. 1,607,677, dated Nov. 23, 1926. In this machine there is a stationary die half 1 which is suitably secured to a hot plate 2 mounted on the frame work 3 of the machine. The movable diehalf 4 is mounted on a carriage 5 located on guide rods 6. This carriage, together with die half 4, is adapted to be moved back and forth by suitable mechanism (not shown) to open and close the die.

When the die is closed, as shown in full lines, in both Figs. 1 and 2, suitable mechanism (not shown) brings the goose-neck nozzle 7 into engagement with an opening formed in the under side of the die, and molten metal is forced from the goose-neck nozzle into the mold cavity 8.

The particular mold illustrated is shown as provided with a series of cores 9. These are mounted in suitable openings in the movable die half 4, so that they maybe moved horizontally to project them into the die cavity 8, or to withdraw them when desired. Each core 9 at its outer end is in the form of a rack 10.

Vertically mounted in the movable die half 4 in a suitable opening provided for the purpose is a shaft 11. The lower portion of this shaft is in the form of an elongated pinion 12. J\

The teeth of pinion 12 enga c with the racks 10 on the several cores 9. ith this arrangement, rotation of pinion 12 by shaft 11 results in a corresponding movement of the several cores in the die.

A crank 13 is mounted on the upper end of shaft 11. It is provided at its outer end with a stud 14 on which is suitably mounted a roller 15. Extending in a horizontal position above the die parts is a combination bar 16. This member is supported at one end on the machine by a bracket 17 on the top of hot plate 2, while the other end of the bar (not shown) is similarly supported on the machine frame. On its under side combination bar 16 carries cam means with which the roller on the end of crank 13 is adapted to coact to effect insertion and withdrawal of the cores during movement of die half 4.

The cam means referred to preferably are in the form of a plate 18 to the under side of which is secured a series of cam blocks 19, 20 and 21. As will be seen clearly from Fig. 2, the shape and arrangement of the cam blocks are such as to form a cam groove 22 through which roller 15 is adapted to move during operation of the device. The cam groove 22, is made up of a pair of diverging, curved portions 23, 24, which are shown open at their outer ends. At their inner ends cam groove portions, 23, 2 1, are connected by an intermediate groove portion 25.

Assuming that the parts are in the positions shown in Figs. 1 and 2, that is, the die is closed, roller 15 will be located within the outer end of the left-hand part 23 of the cam groove 22. At the same time crank 13 is disposed substantially in longitudinal alinement with the cam device and the cores 9 are fully projected into the die. Afterthe casting has been shot the movable die half 4, carrying shaft 11, is moved .to the right to the dotted line position of Fig. 2. During this movement the cores 9 are intended to be withdrawn from the die cavity, so that the casting may be ejected from the mold. This withdrawal of the cores is accomplished in the present device through coaction of roller 15 and cam groove 22, as now will be explained.

As soon as movable die half l starts towards the right, carrying shaft 11 and crank 13, roller 15 will move through portion 23 of the cam groove. Due to the shape of this portion of the groove, crank 13 will be partially rotated in a counter clockwise direction, when viewing the device from above. During this movement roller 14 has been operated upon primarily by the lower surface 26 of the cam groove to cause rotation of the crank.

As die half 4; continues its movement to the right, crank 13 will assume the upright or intermediate position shown in dotted lines in Fig. 2. Further movement to the right of die part 4 and shaft 11 will result in engagement of roller 15 with the upper surface 27 of the cam groove. At the same time the lower surface 26 of this portion of the groove serves to maintain roller 15 in proper position. Thus, the latter portion of the movement of roller 15 causes crank 13 to continue its counter clockwise rotation, until the crank assumes the right-hand, dotted line position of Fig. 2.

f This movement of crank 13 will result in the core pieces 9 being moved from the lefthand position of Fig. 2 to the fully withdrawn, dotted line position of the same figure. In this manner the cores are withdrawn at the proper time so that the casting may be ejected.

It is to be noted that with the arrangement described the shaft 11, which forms the pivotal support for crank 13, is moved a predetermined distance in a straight path, during which the shaft is rotated through a definite angle dependent upon the shape of the cam groove 22. In other words, when it is desired to rotate shaft 11 through a selected angle during the travel of the movable die part 4L- in one direction, cam groove 22 is shaped so as to bring about the necessary angular movement of crank 13. 7

As shown in Fig. 2, the left-hand portion of cam groove-22 is made longer than the right- 's hand portion of the groove. Initially, crank 13 is in alinement with the path to be taken by shaft 1].. Consequently at the end of the travel of die part 4 crank 13 has been moved through an angle of due to the partic- 1 ular shape given the cam groove. This accomplishes a definite retractive movement ofthe cores, so that they are withdrawn from the die cavity.

It will be seen that, when die part 4 moves 12:

toward closed position, the reverse of the operation ofthe parts just described will take place. Roller 15, during the closing movement of the die, will ride on lower surface 26 of the right-hand portion of the cam groove,

and after the intermediate position of crank 13 is passed, the roller will engage the upper surface 27 of the left-hand portion of the cam groove. In this manner, crank 13 and shaft 11 are rotated through the same angle, but in 1 a clockwise direction. This causes the cores 9 to be advanced again into the die cavity, as

appears at the left-hand side of Fig. 2.

Where it is desired to impart a greater or lesser movement to the core pieces 9, it will be necessary, of course, to effect a definite, angular movement of shaft 11 through crank 13 and the cam mechanism. This is accomplished readily by substituting a cam in which the'groove is of a somewhat different shape.

The cam shown in Fig. 3 is designed to effect a angular movementof crank 13, during the movement of shaft 11 from its full line position to the dotted line position at the right of the figure. With this arrangement,

it will be noted that initially crank 13 is not disposed in longitudinal alinemcnt with the cam, but at an angle thereto. Thus, it will be seen, that as roller 15 travels through cam groove 22 crank 13 first moves to the longitudinally alined position, and then continues its movement in the same direction until it has been displaced 195, in the manner described in detail above.

At the end of the more movement, crank 13 is in longitudinal alinement with the cam means, but is located on the opposite side of shaft 11. Upon movement of shaft 11 back toits original position, the action of the cam device will cause the shaft to revolve through the same angle, but in the reverse direotio The cam of F ig. 4 is designed to effect a 180 rotation of shaft 11 in a counter clockwise direction. In this form of the device, crank 13 is moved from a position in longitudinal alinement with the path to he traveled by shaft 11 to a similar position on the oppo site side of the shaft. 1

In Fig. 5, the cam means shown serves to rotate the shaft 210, during its bodily movement from the full line to the dotted line position at the right of the figure.

It will be clear that any desired angle of rotation of lever 13 about its pivot may be effected by varying the form of thecam means in accordance with the distance to be traveled by the support upon which the lever is pivoted. When this distance is known, it is a comparatively simple matter to determine the exact shape of the cam which will serve to rotate the lever through a desired angle.

While in the several forms of the invention illustrated and described, the cam means have been shown as stationary and shaft 11, the support for crank 13, as movable, it is obvious that the reverse of this arrangement may be used, and yet obtain the desired angular movement. In other words, it is immaterial whether the cam or the pivotal support for the crank be moved, so long as there is the necesssary relative movement between these parts.

It is to be noted that in all of the forms of the device disclosed herein, when roller 15 arrives at the intermediate, dotted line position of Figs. 2 to 5, inclusive, in other words, at the point of intersection of groove portions 23, 24, crank 13 occupies a position sub stantially at right angles, or normal, to the path of movement of shaft 11, which, in the examples shown, is straight.

By means of the mechanism described, it is obvious that it is possible to secure a movement of the parts heretofore unobtainable in other mechanisms. The means utilized to accomplish this purpose are extremely simple in form and operation. The adaptability of such a mechanism to many uses is readily appreciated.

The terms and expressions employed herein are used as terms of description and not of limitation, and there is no intention, in the use of such terms and expressions, of excluding any mechanical equivalents of the features shown and described or portions thereof. It is recognized that various structural modifications are possible within the scope of the invention claimed.

What is claimed is:

1. In a mechanical movement the combination of a cam having a air of oppositelyinclined, intersecting sur aces a crank having a pin adapted to engage saidinclined sur faces in succession upon'relative movement between the fulcrum of said crank and said inclined portions to rotatethecrank; and means for effecting such relativemovement, the parts being constructed and arranged so that. the crank occupies a position normal to the path of said relative movement when the pin is at the point of intersection of said inclined surfaces. v

2. In a mechanical movement thecombination with a crank having a cam-engaging portion, of a pair of diverging, intersecting cam surfaeesadapted for successive coaction with said cam-engaging portionyand means for effecting relative movement between the fulcrum of said crank and said cam surfaces to rotate the crank, the parts being constructed and arranged so that the crankoccupies-a position normal to the path of said relative movement when the cam-engaging portion isatthe point of intersection of said cam surfaces.

3. The combination of a movable support; alever pi'votallymounted on the support and having a projection thereon a stationary cam having a groove to receive said projection, said groove including a pair of. diverging portions through. which; said projection is adapted to pass successively during movement of said supportto rock said lever in one direction; and means for moving said support.

4a. The combination of a support movable in a straight line; a lever pivoted on the support and having a projection thereon; astationary memberhaving a cam groove to receive said projection, said groove includinga pair of oppositely curved portions through which said projection passes successively duringmovement of the support to rock said lever in one direction; andmeans for actuating said support.

5. The combinaton of a support movable in a straight line; a crank'pivoted on the support and .havinga pin thereon; a stationary member having a cam groove to receive said pin, said groove including a pair of oppositely curved portions of different lengths through which said pin passes. successively during movement of the support to rock said crank in one direction; and means for actuating said support.

6. In a mechanical movement the combination of a shaft adapted for bodily movement in a fixed path; a crank mounted on the shaft and having. a projection; a stationary cam provided with a groove, said groove comprising a pair of oppositely-curved, intersecting portions through which said projection is adapted to pm in succession; and

' movement in a fixed path; means for imparting definite bodily movement thereto; a crank mounted on the shaft and provided with a-projection; and a stationary grooved cam, said groove including a pair of diverg ing, curved portions and a connecting portion therebetween through which the projection passes during movement of the shaft, the parts being constructed and arranged so that said movement of the shaft effects a predetermined, angular displacement of the crank and corresponding rotation of the shaft.

8. The combination of a supporting member; a-cam member, one of said members being adapted for movement ina straight line; a lever pivotally mounted on the supporting member and having a projection engaging a groove on the cammember, said groove being shaped and the parts disposed so that at different periods during operation of the movable member, said projection'is located on opposite sides of a line intersecting the fulcrum point of the lever and perpendicular to the path of the movable member; and actuating means for the movable member.

9. The combination of a support movable in a definite path; a lever pivoted on the support and having a projection; a stationary cam having a groove to receive said projec- 1 ii tion; said groove being shaped and the parts disposed so that during movement of the support said projection first moves in advance of and then follows said support; and operating means for the support.

10. In a mechanical movement the combination of a shaft mounted for bodily movement in a fixed path; a crank mounted on the shaft and having a projection on its free end; a stationary cam having a groove to receive a said projection, said groove being shaped and the parts disposed so that during movement of the shaft said projection moves first in advance of and then behind said shaft; and means for imparting bodily movement to the 5 shaft.

11. The combination of a supporting member; a lever pivotally mounted on said supporting member and having a projection thereon; a cam member having a groove to receive said projection, said groove including a pair of .diverging portions through which the projection is adapted to pass successively during relative movement between the supporting member and the cam member, and

because of said relative movement, to rock the lever iii one, direction through an angle of 180 degrees or more; and means for'causing relative movement between said members.

-.12. The combination of a supporting member; a lever pivotally mounted on said supporting member and having a projection thereon; a cam member'having a groove to receive said projection, said groove includin a pair of diverging-portions through whic the projection is adapted to pass successively during relative movement between the supporting member and the cam member, and because of said relative movement, to rock the lever in one direction, said diverging portions of the cam groove being inclined to the line of relative movement between the supporting member and the, cam member; and means for causing relative movement between said members. 7

"13. The combinationof a supporting member; a lever pivotally mounted on said supporting member and having a projection thereon; a cam member having a groove to receive said projection, said groove including a pair of diverging portions through which the projection is adapted to pass and to engage opposite edges thereof successively during relative movement between the supporting member and the cam member, and because of said relativemovement, to rock the lever in one direction; and means for causing relative movement between said members.

In testimony whereof I have signed my name to this specification.

TORBJORN CONRAD KORSMO. 

